Ok, here we goes with some discoveries (1.1 patch, PIF values in descr_settlement_mechanics.xml set to 1.0):
- taxable_income_bonus displays correctly but has no effect
- income_bonus doesn't display correctly (Instant income bonus %d florins +<bonus>) but it correctly adds the <bonus> as neat income coming from buildings.
- trade_level_bonus doesn't display the bonus but it works (land trade only), even if the formula used is still a mistery to me (with a bonus of 1 a land trade income of 52 raised to 181).
- trade_base_income_bonus doesn't display the bonus but it works (all kind of trades), the bonus appears to be a 10% on the trade income.
- farming_level. Base farming level is set in descr_regions.txt and it gives 80 florins (average harvest) for each point. So each farming_level bonus point increase the incomes of 80 florins. Btw, there's no bonus points limit to 5, I managed to give 10 bonus points but it seems they don't add up if they're on different buildings (at least 10 points in the walls and 1 point in land clearance didn't add up in my test).
- weapon_missile_mechanical displays correctly the bonus but whatever value you put there the retrained missile unit will gain 1 point in melee attack on its card. How this translate in real combat is left to further experiments (I wonder if it's the same as armor upgrades).
- population_loyalty_bonus displays correctly the bonus but doesn't seem to work just like in RTW.
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